physics equations

speed

speed = distance/time

acceleration

acceleration = change in speed/change in time

weight

Weight = mass x gravitational field strength

density

mass/volume

hookes law

F= k x X

force

Force = mass x acceleration

moment

moment = force x perpendicular distance from pivot

clock moments

sum of clockwise moments = sum of anticlockwise moments

pressure

pressure = force x area

kinetic energy

kinetic energy = 1/2 x mass x velocity squared

gravitational potential energy

GPE = mass x gravitational field strength x change in height

efficiency - energy

efficiency = Useful energy output / total energy input x 100

efficiency - power

efficiency = Useful power output / total power input x 100

work done

work done = force x distance moved = change in energy

pressure - liquid

pressure = height x density x gravity

power - energy

power = change in energy/time

momentum

momentum = mass x velocity

impulse

impulse = force x change in time = mass x final velocity - mass x initial velocity

boyles law

pressure x volume = constant

energy - specific heat capacity

energy = mass x specific heat capacity x change in temp

frequency

frequency = number of waves / time

wave speed

wave speed = frequency x wavelength

angle of incidence

angle of reflection

sin i/sin r

sin i/sin r = n or n1 sin i = n2 sin r

n

n = 1/sinc

current

current = charge/time

resistance

resistance = voltage/current

voltage

voltage = work done/charge

total resistance - series

total resistance = resistor 1 + resistor 2 + etc

total resistance - parrallel

total resistance = 1/resistor 1 + 1/resistor 2

power - volts

power = voltage x current

energy

energy = current x voltage x time

cost of electricity

cost of electricity = kWh used x cost per kWh

velocity of orbit

velocity = 2 x pi x radius/time period of one orbit

hubbles constant

hubbles constant = recession velocity of galaxies/ distance to galaxy

distance/recession velocity of galaxies

1/ hubbles constant = age of universe